Computer user interface for a display screen



FIG. 1 is a front view of a computer user interface for a display screen showing the first embodiment of our new design; and,

FIG. 2 is a front view of a second embodiment thereof.

The broken-line showing of the display screen and the text, images and other features within the claimed subject matter forms no part of the claimed design. 

The ornamental design for a computer user interface for a display screen, as shown and described. 